The UAVariableType "4:WSAnalogUnitType" (NodeId="ns=4;i=2000"), has no "EngineeringUnits" property.
This property is mandatory from OPCUA Core UAVariableType "AnalogUnitType",(NodeId="i=17497").
I would expect to find it on Opc.Ua.Weihenstephan.NodeSet2.xml (something like this):

<UAVariableType NodeId="ns=4;i=2000" BrowseName="4:WSAnalogUnitType">
<DisplayName>WSAnalogUnitType</DisplayName>
<Documentation>https://reference.opcfoundation.org/v104/Weihenstephan/v100/docs/8.1&lt;/Documentation>
<References>
<Reference ReferenceType="HasProperty">i=17502</Reference>
<Reference ReferenceType="HasSubtype" IsForward="false">i=17497</Reference>
</References>
</UAVariableType>
<UAVariable NodeId="ns=4;i=6028" BrowseName="EngineeringUnits" ParentNodeId="ns=4;i=2000" DataType="i=887">
<DisplayName>EngineeringUnits</DisplayName>
<References>
<Reference ReferenceType="HasTypeDefinition">i=68</Reference>
<Reference ReferenceType="HasModellingRule">i=78</Reference>
<Reference ReferenceType="HasProperty" IsForward="false">ns=4;i=2000</Reference>
</References>
</UAVariable>